Which pressure test is typically used for drain, waste, and vent piping?

Hydrostatic testing is the standard method used for testing the integrity of drain, waste, and vent (DWV) piping systems. This type of test involves filling the piping system with water at a specified pressure to check for leaks and ensure that there are no weaknesses or failures in the system. The use of water effectively simulates the conditions the pipes will face during normal operation, allowing any potential issues to be identified before the system is put into service.

Hydrostatic testing is particularly advantageous for DWV systems since it allows for a direct observation of any leaks, which can be visually detected over time. The test is conducted by sealing the piping system and applying pressure, typically higher than the normal operating pressure, to ensure the durability and reliability of the system.

Other testing methods such as gas pressure testing, vacuum testing, and static pressure testing are not suited for DWV applications. Gas pressure testing is primarily used for gas lines, vacuum testing is typically utilized for testing the integrity of underground piping, and static pressure testing is not specifically aligned with the needs and characteristics of DWV systems. Thus, hydrostatic testing is the most appropriate and effective choice for assessing the performance and safety of drain, waste, and vent piping.